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Anomalous X-Ray Scattering On Self-Assembled Islands: Direct Evaluation Of Composition Profile, Strain Relaxation, And Elastic Energy

Published online by Cambridge University Press:  11 February 2011

A. Malachias ,
R. Magalhães-Paniago ,
G. Medeiros-Ribeiro ,
S. Kycia ,
T.I. Kamins  and
R. Stan
A. Malachias
Affiliation:
Departamento de Física, Universidade Federal de Minas Gerais, MG, Brazil
R. Magalhães-Paniago
Affiliation:
Departamento de Física, Universidade Federal de Minas Gerais, MG, Brazil Laboratório Nacional de Luz Síncrotron, Campinas, Brazil
G. Medeiros-Ribeiro
Affiliation:
Laboratório Nacional de Luz Síncrotron, Campinas, Brazil Hewlett-Packard Laboratories, 1501 Page Mill Rd., Palo Alto, CA 94117
S. Kycia
Affiliation:
Laboratório Nacional de Luz Síncrotron, Campinas, Brazil
T.I. Kamins
Affiliation:
Hewlett-Packard Laboratories, 1501 Page Mill Rd., Palo Alto, CA 94117
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Abstract

The growth of Ge on Si(001) produces a wealth of morphologies of nanocrystals. After the deposition of a two-dimensional Ge film 3.5 monolayers thick, islands are formed, and several shape transitions can be observed depending on the growth temperature, rate and deposited thickness. In this work we combine atomic force microscopy and two different types of measurements of anomalous x-ray scattering to determine this elastic energy both in pyramid and dome shaped islands. By comparing pyramids and domes data, we have observed both an increase of lattice parameter and enhancement of interdiffusion for the domes. These results show that there is a drastic decrease of the elastic energy stored per atom upon this particular shape transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , F2.5
Copyright
Copyright © Materials Research Society 2003

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